JP2000194453A - Hot-line insertion and extraction control system for multiplied device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to replace a faulty PK without any trouble to the operation state of a processor by assigning a reset line to a long pin of a connector for hot-line insertion and extraction and then suppressing PK insertion/extraction noise generated at the time of the PK replacement. SOLUTION: This system comprises multiplied or parallelized PKs 10, 20, and 40 and a BB(back board) 30 where the PKs 10, 20, and 40 are mounted. The PKs 10, 20, and 40 and BB 30 are connected by hot-line insertion and extraction connectors having pins differing in length in three stages; and a ground line is assigned to the long pin of the connector, power lines are assigned to the intermediate pin, and normal signal lines are assigned to the short pins. The PKs 10, 20, and 40 of this information processor are equipped with reset lines for lower power consumption in reception. Then the PKs 10, 20, and 40 have a mechanism receiving a rest signal from a PK other than them through a reset line, which is assigned to the long pin of the hot-line insertion and extraction connector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-line insertion / removal control system for realizing maintenance during operation of a processing apparatus.

[0002]

2. Description of the Related Art In some information processing apparatuses, a plurality of PKs having the same function are mounted and multiplexed in order to improve the operation rate.
In such an apparatus, when one of the multiplexed PKs fails, the external interface control is continued by another normal PK, so that it is possible to continue to operate at the apparatus level.
Further, with respect to recent information processing apparatuses, there is an increasing demand for operation-time maintenance that realizes replacement of a failed unit without stopping the apparatus. There are two general methods for implementing maintenance during operation: a method in which the power supply to the failed part is cut off and replaced, and a method in which the power supply is inserted and removed with hot wires while power is supplied. The latter, which is not necessary, is advantageous.
However, when replacing a failed PK by the hot-swap method, noise is generated in the power supply due to a sudden change in the current consumption at the time of PK insertion / removal from the inserted / removed PK in the control signal for the other operating PK. Therefore, a technique for reducing noise is required.

[0003]

[0006] If a PK fails,
When the fault PK is maintained during operation by hot swapping, the noise generated in the control signal for the other PK from the swap PK is suppressed, and the power consumption noise is reduced by reducing the change in current consumption when the fault PK is inserted and removed. The PK can be replaced reliably and non-stop without causing malfunction of the external interface control by the other PK during operation.

[0004]

SUMMARY OF THE INVENTION A control signal output driver that causes a device to malfunction due to PK insertion / removal noise has a high impedance characteristic so as not to generate PK insertion / removal noise. P
The output driver of K maintains the high impedance state according to the instruction of another PK. Further, in order to reduce a change in current consumption at the time of PK insertion / extraction, the insertion / extraction PK is reset according to an instruction of another PK before the PK insertion / extraction operation, and the reset state is released after the insertion / extraction operation is completed. In order to maintain the high impedance state of the driver and the reset state of the insertion / removal PK,
A hot-swap connector that has a mixture of pins of three different lengths is used, and the pin assignment of the hot-swap connector is the ground pin, high-impedance control pin and reset signal pin as long pins, and the power pin as middle pin. The switching control signal pin is a short pin.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hot-swap control method for a multiplexer according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a duplexer according to an embodiment of the present invention.

The duplexer shown in FIG. 1 duplicates PK10 and PK20 in order to improve the operation rate. In this apparatus, PK10 normally controls an external interface via BB30 and PK40. The PK 20 is on standby in case a failure occurs in the PK 10. Also, although not written in the figure, the signal is in a high impedance state or
Pull-up processing is performed on the sink side for the input open state.

The PK 10 includes an interface control logic 120 for a function of controlling an external interface, and a mutual monitoring mechanism 140 for mutually monitoring a failure report of the PK to the PK 20 and detection of a failure occurrence of the PK 20.
And the other system inhibition latch 110 for inhibiting the external interface control of the PK 20 when the failure of the PK 20 is detected by the mutual monitoring mechanism, and all the latches on the insertion / removal PK 20 when the failed PK 20 is hot-swapped / exchanged. A connector 310 for hot-line insertion / removal, which includes a reset latch 130 for the purpose of issuing a reset and for making the output of the driver 211 high-impedance, and a connector between the PK 10 and the BB 30 having three-stage long and short pins. Is provided.

The PK 20 has the same structure as the PK 10, and the description is omitted.

The BB 30 is provided with a connector that engages with the live connector of the PK 10 and PK 20.

The PK 40 controls the switching of the output signals of the interface control logics 120 and 220 to the external interface in accordance with the output signals of the other system inhibition latches 110 and 210 by the switching control unit 410.

Here, a failure occurs in the PK 10 and the PK 10
An example will be described in which maintenance is performed during operation. First, when the PK 20 detects the occurrence of the PK 10 failure, the mutual monitoring mechanism 240
Activates three processes in order to continue the external interface control of the PK 10. First, by setting the other-system reset latch 230, the current consumption is reduced by setting the PK 10 to the reset state, and the other-system reset latch 130 is also forcibly reset, so that the driver 211 is surely enabled and the driver 111 is forcibly forced. In this case, the external interface control from the PK 20 is released from the high impedance state. Second, the other system inhibition latch 210
Is set, the interface control logic 120 is disconnected from the external interface in the switching control unit 410. Third, the control logic 220 of the interface is activated and P
K20 starts external interface control.

Thus, the process of changing the external interface from the PK 10 to the PK 20 is completed.

Next, the PK 10 is replaced by hot swapping.

When the extraction of the PK 10 is started, the short pin is in the second stage in the first stage, the middle pin is in the third stage and the long pin is B in the third stage.
B is cut off, and the withdrawal is completed. The following describes what effect PK20 and PK40 have in this process.

In the first stage, the signals 11 to 14 are disconnected from the BB 30 while the power supply 16 of the PK 10 is turned on.
When the signal 11 is disconnected, the input of the switching control unit 410 changes from the high impedance state to the open state, but the high level is maintained by a pull-up process on the PK 40 not shown in the figure. At this time, since the signal 23 from the other system reset latch 230 is received by the long pin in the PK 10, the high impedance state of the driver 111 does not change. Next, when the signal 12 is cut off, noise is generated at the input of the AND circuit of the switching control unit 410, but the noise is suppressed by the signal 21, which is the condition of the AND circuit, so that the influence of the noise on the external interface is reduced. Do not give. Next, when the signal 13 and the signal 14 are cut off, noise is generated in the PK 20, but a noise removing circuit (not shown) is provided on the PK 20, so that the driver 211, the reset issue, and the mutual monitoring mechanism 240 malfunction. I try not to.

In the second stage, the power supply 16 is turned off, but the reset state of the PK 10 is maintained due to the assignment of the signal 23 to the long pin, and the power supply 16 is turned off with the current consumption of the PK 10 reduced. Therefore, power supply noise during disconnection is reduced.

In the final third stage, the ground 15 and the signal 2
3 is cut and the extraction of the PK 10 is completed.

Next, when the insertion of the PK 10 is started, the long pin is connected to the BB in the first stage and the short pin is connected to the BB in the third stage in the first stage. In the process, PK20 and PK4
The following describes what effect this has on 0.

In the first stage, the ground and the signal 23 are connected, but this stage has no effect on the PK 20 and the PK 40.

In the second stage, the power supply 16 is connected, but since the signal 23 is assigned to a long pin and the PK 10 is in the reset state, the change in current consumption is small, and power supply noise generated in the entire apparatus when the power supply 16 is connected. Is decreasing.

In the third stage, the signals 11 to 14 are connected. When the signal 23 is previously connected in the first stage and the signal 11 is connected, the input of the switching control unit 410 changes from open to a high impedance state in the switching control unit 410.
The pull-up process on the PK 40 not shown in the drawing originally maintains the high level in the open state, and the pull-up process not shown in the drawing is also applied to the signal 11 on the PK 10, so that both transmission and reception sides are performed. Therefore, no noise is generated on the signal 11 at all. Next, when the signal 12 is connected, noise is generated at the input of the AND circuit of the switching control unit 410, but is suppressed by the signal 21, which is a condition of the AND circuit, and therefore does not affect the external interface. . Next, when the signals 13 and 14 are connected, noise is generated in the PK 20, but a noise removing circuit (not shown) is provided on the PK 20, so that the driver 211, reset issuance, and the mutual monitoring mechanism 24 malfunction. I try not to.

After the insertion of the PK 10 is completed, the mutual monitoring mechanism 240 thereafter detects the recovery of the failure of the PK 10, so that the other system reset latch 230 which has been activated since the failure was detected is reset to reset the PK 10. And the high impedance state of the driver 111 is released. In addition, the other system inhibition latch 210 is also reset, and the external interface control inhibition of the PK 10 is also released, to prepare for the occurrence of the next failure.

As described above, it is necessary to appropriately assign a pin to a hot-swap connector having three different length pins, to use a high-impedance driver in place, and to reduce the current consumption by reset. By using this, it is possible to perform hot-swap exchange of the PK without stopping the external interface control.

[0025]

According to the present invention, the output signal noise of the exchange PK generated at the time of PK exchange can be suppressed and the power supply noise can be reduced, so that the PK of the multiplexing device can be reduced without stopping the external interface function. Hot swapping can be easily realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a duplexer according to an embodiment of the present invention.

[Explanation of symbols]

 1 Duplexer 10, 20 PK 210 Other system inhibition latch 211 Driver 120, 220 Interface control logic 130, 230 Other system reset latch 140, 240 Mutual monitoring mechanism 30 BB 40 PK 41 Switching control unit 12, 13, 14, 21 , 22,23 Signal 15,25 Ground 16,26 Power

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masamichi Ando 1 Horiyamashita, Hadano City, Kanagawa Prefecture Inside Nichi Information Technology Co., Ltd. (72) Inventor Mitsunaga Kawasaki 1 Horiyamashita, Hadano City, Kanagawa Prefecture Nichi Information Within technology

Claims (2)

[Claims] A plurality of multiplexed or parallelized PKs
And a BB (backboard) for mounting the plurality of PKs. The plurality of PKs and the BB are connected by a hot-line insertion / extraction connector having pins of three different lengths mixed together. In the information processing apparatus in which a ground wire is assigned to a long pin of the wire insertion / extraction connector, a power supply wire is assigned to a middle pin, and a normal signal wire is assigned to a short pin,
Has a reset line that is in a low power consumption state upon reception,
The multiplexing device, wherein the plurality of PKs include a mechanism for receiving a reset from a PK other than the PK through the reset line, and the reset line is assigned to a long pin of the hot-swap connector. Hot-swap control method. 2. A plurality of PKs multiplexed or parallelized.
, A common PK for controlling a common external interface by a plurality of PKs, and a BB for mounting all the PKs. The plurality of PKs and BBs include pins having different lengths in three stages. The hot-swap connector has a pin assignment of a ground wire to a long pin, a power supply wire to a middle pin, and a normal signal wire to a short pin. The plurality of PKs include a suppression signal for suppressing a control signal related to a common external interface operation of a PK other than the PK, and a driver having a high impedance characteristic is used for the suppression signal, and the driver is set to a high level. It has a disable line for setting an impedance state, and has a function of receiving the disable signal from a PK other than the PK. , Hot plug control method of a multiplexing device, characterized in that are assigned the disable line to the length pins of the hot plug connector.